CN211285315U - Construction structure for removing arch ring of upper-span existing line arch bridge - Google Patents

Abstract

The utility model discloses a construction structure for removing arch rings of an upper-crossing existing line arch bridge, which comprises a left rope saw and a right rope saw which are symmetrically arranged, and a front crane and a rear crane which are used for respectively hoisting the arch rings to be hoisted one by one, wherein a hoisting structure for hoisting the arch rings to be hoisted is arranged below a hoisting arm of each crane; each crane is supported on a crane working platform; and N-1 groups of rope penetrating holes for a rope saw chain of a rope saw to pass through are formed in the dismantled arch ring from front to back along the width direction, and each hoisting structure comprises a hoisting frame supported at the bottom of the arch ring to be hoisted and a group of hoisting ropes for synchronously hoisting the hoisting frame and the arch ring to be hoisted supported above the hoisting frame. The utility model has the advantages of reasonable design and hoist and mount portably, excellent in use effect will be dismantled the arch ring through two rope saws in step and cut into a plurality ofly and treat hoist and mount arch ring to hoist and mount a plurality of arch ring symmetries of treating of forming after cutting through two loop wheel machines around, can accomplish the process of demolising of being dismantled the arch ring portably, fast.

Description

Construction structure for removing arch ring of upper-span existing line arch bridge

Technical Field

The utility model belongs to the technical field of the bridge construction, especially, relate to an existing line arch bridge arch ring of striding on demolishs construction structures.

Background

At present, the second line engineering and the updating and reconstruction engineering of the existing electrified railway in China are more, most lines of the newly-built second line are built next to the existing railway, the standard is low during the building of the existing railway, the positions of the second line are not reserved under the planning and investment limitations, and most of bridges which cross the existing railway need to build new bridges and remove old bridges during the building of the second line, so that the construction requirement of the roadbed engineering of the newly-built second line can be met. When a highway and municipal engineering are upgraded and transformed, when the line is limited to be changed, when a highway-span iron bridge is upgraded and transformed in situ, the existing bridge also needs to be dismantled, and when the highway-span iron bridge with serious diseases endangers the railway operation safety, hidden dangers also need to be removed in time to eliminate the hidden dangers.

At present, when an overpass bridge (specifically a concrete simply supported beam) of an upper-span electrified railway is dismantled in China, a dismantling scheme of integrally hoisting an integral beam body is generally adopted, a road needs to be closed and stopped, a travelling crane needs to be interrupted during actual dismantling, and the integral blasting dismantling is carried out after the detour. At present, a common demolition method is an in-situ demolition method based on temporary. However, when a highway arch bridge (namely a highway-crossing iron arch bridge) which is built in the early 70 th of the world and spans the existing railway line is dismantled, due to the fact that the structure of the dismantled arch bridge is special and is influenced by factors such as shortage of steel materials and materials, the dismantled arch bridge adopts an open cut tunnel structure consisting of a plain concrete arch ring and a stone slab paving structure to meet the traffic requirement of the highway-crossing railway overpass, the mainstream and the generation products of the highway-crossing railway overpass on national roads and rural roads are solved at that time, but the highway-crossing railway overpass cannot be hoisted and dismantled integrally, the overall dismantling difficulty is very large, and particularly when the dismantled arch bridge is located in mountainous areas and valleys, the construction site is narrow, the overall dismantling difficulty is larger, and the implementation is basically impossible. When the temporary suspension line is constructed by adopting the in-situ dismantling method based on constructing the temporary suspension line for dismantling, the temporary suspension line is constructed, the existing railway train is required to be interrupted after the temporary suspension line is opened, and then the overpass in-situ dismantling is carried out, but the in-situ dismantling method is limited by the reasons of the existing station type, the great difficulty in dismantling the residential areas of villages along the line and the like, the in-situ dismantling implementation condition for constructing the temporary suspension line is not provided, and the line-changing investment is large when the in-situ dismantling method for constructing the temporary suspension line is adopted. Therefore, when the existing arch bridge on the upper span which is limited in construction site and cannot be subjected to temporary line changing is dismantled, the in-situ dismantling construction can be carried out only by utilizing daily maintenance 'skylight points' under the condition of ensuring that the transportation and driving safety of the existing operation railway are not influenced.

When the in-situ demolition is actually carried out, the arch ring of the demolished arch bridge is a plain concrete arch ring, the width of the arch ring is the same as the transverse bridge width of the demolished arch bridge, the arch ring is large in width and 5-10 m in width, so that the demolished arch ring is quite heavy and needs a crane of more than 300t, but the large-tonnage crane cannot enter a construction site due to limited construction site, and the demolished arch ring is a plain concrete arch ring, so that when the demolished arch ring is integrally demolished and hoisted, the arch ring is extremely easy to break and falls, traveling equipment such as overhead contact systems, circuit steel rails and other underground optical cables below the demolished arch bridge is damaged, and major accidents are caused, and the scheme for integrally demolishing and hoisting the arch ring is limited by the construction site, the structural characteristics of the plain concrete arch ring and the like, and cannot be implemented. However, when the demolition arch ring is demolished by adopting the blasting method, the construction difficulty is high, the risk is high, and the interference on the existing railway line is very large.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a construction structure for removing the arch ring of the over-span existing line arch bridge, which has the advantages of reasonable structural design, simple and convenient lifting and good use effect, and can cut the removed arch ring into a plurality of arch rings to be lifted through two rope saws synchronously, and can symmetrically lift the plurality of arch rings to be lifted formed after cutting through the front and the rear lifting machines, thereby simply and quickly completing the removing process of the removed arch ring; and five hoisting holes are formed in the middle of each arch ring to be hoisted from left to right, the arrangement positions of the five hoisting holes are specifically limited, the arch crown hoisting points corresponding to the middle hoisting holes do not bear loads, the two hoisting holes on the left side share one steel wire rope, the two hoisting holes on the right side share the other steel wire rope, the steel wire ropes on the left side and the right side slip on the hoisting tool during hoisting until the stress is balanced, the problem of load distribution of each hoisting point is solved, and stable hoisting can be simply, conveniently and quickly carried out on the arch ring to be hoisted.

In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a construction structures is demolishd to existing line arched bridge arch ring of striding on, its characterized in that: the device comprises a left rope saw and a right rope saw which are symmetrically arranged and cut a dismantled arch ring into N arch rings to be hoisted from front to back and a front crane and a rear crane which respectively hoist the arch rings to be hoisted formed after cutting one by one, wherein the dismantled arch ring is an arch ring of a dismantled arch bridge, the dismantled arch ring is horizontally arranged and has a semicircular cross section, and the two rope saws are arranged on the same vertical surface; a hoisting structure for hoisting an arch ring to be hoisted is arranged below the hoisting arm of each crane; wherein N is a positive integer and N is not less than 5;

the demolished arch bridge is positioned between a left slope and a right slope, the demolished arch bridge is a grouted rubble masonry structure which is vertically arranged and spans an existing railway line, a middle open cut tunnel for the existing railway line to pass through is arranged below the middle part of the demolished arch bridge, the tunnel top of the middle open cut tunnel is arched, the left side wall and the right side wall of the middle open cut tunnel are vertical side walls arranged along the transverse bridge direction, the demolished arch ring is a middle arch ring positioned at the tunnel top of the open cut tunnel, the middle arch ring is a plain concrete arch ring, and the two vertical side walls of the middle open cut tunnel are symmetrically arranged below the left side and the right side of the middle arch ring; the masonry structure of the mortar rubble is divided into an arch-up structure positioned above the middle arch ring and an arch-down structure positioned below the middle arch ring by taking the middle arch ring as a boundary, the arch-down structure is supported on the ground, the upper surface of the arch-down structure is flush with the upper surface of the vertical side wall, and the arch-down structure is divided into a left arch-side arch-down structure and a right arch-side arch-down structure by taking the middle open cut tunnel as a boundary;

the two cranes are respectively positioned at the front side and the rear side of the left side under-arch structure or the right side under-arch structure, each crane is supported on a crane working platform which is horizontally arranged, and the two crane working platforms are respectively arranged on the ground at the front side and the rear side of the arch bridge to be dismantled;

the arch ring to be dismantled is divided into N arch rings to be hoisted from front to back along the width direction, the cross sections of the N arch rings to be hoisted are semicircular, and the cross section structures and the sizes of the N arch rings to be hoisted are the same as those of the arch ring to be dismantled; n-1 groups of rope-penetrating holes for a rope saw chain of a rope saw to penetrate through are formed in the dismantled arch ring from front to back along the width direction, each group of rope-penetrating holes are located on the same cross section of the dismantled arch ring, and the plane where each group of rope-penetrating holes is located is a cutting surface of the dismantled arch ring; each group of rope threading holes comprises three rope threading holes positioned on the same cross section of the removed arch ring, each three rope threading hole comprises a middle rope threading hole and two side rope threading holes which are symmetrically arranged at the left and right, each middle rope threading hole is vertically arranged and positioned in the middle of the arch ring to be hoisted, and the two side rope threading holes are symmetrically arranged on the left and right arch feet of the arch ring to be hoisted;

each hoisting structure comprises a hanger supported at the bottom of the arch ring to be hoisted and a group of hoisting ropes for synchronously hoisting the hanger and the arch ring to be hoisted supported above the hanger, the hanger is an arc hoisting frame formed by welding a plurality of steel bar pieces, the arc hoisting frame is positioned right below the arch ring to be hoisted, and the upper surface of the arc hoisting frame is in contact with the bottom surface of the arch ring to be hoisted;

five hoisting holes are formed in the middle of the arch ring to be hoisted from left to right, the five hoisting holes are uniformly distributed on the same cross section of the removed arch ring, the five hoisting holes are cylindrical straight drill holes and are distributed from left to right along the outer contour line of the arch ring to be hoisted, and the central axes of the five hoisting holes are intersected on the circle center O of the arch ring to be hoisted; the five hoisting holes comprise a middle hoisting hole positioned at the arch crown of the arch ring to be hoisted, two upper hoisting holes symmetrically arranged left and right and two lower hoisting holes symmetrically arranged left and right, the included angles between the two upper hoisting holes and the horizontal plane are both 45 degrees, and the geometric center points of the two lower hoisting holes and the center of gravity of the arch ring to be hoisted are positioned on the same horizontal straight line; the two upper hoisting holes are respectively a left upper hoisting hole and a right upper hoisting hole which are positioned on the left and right sides of the middle hoisting hole, and the two lower hoisting holes are respectively a left lower hoisting hole and a right lower hoisting hole which are positioned on the left and right sides of the middle hoisting hole;

each group of hoisting ropes comprises three hoisting ropes hung between a hoisting tool of a crane and an arch ring to be hoisted, and each hoisting frame and the arch ring to be hoisted supported by the hoisting frame are hung under one hoisting tool through one group of hoisting ropes; the three hoisting ropes are uniformly distributed on the same vertical surface and respectively comprise a left hoisting rope, a middle hoisting rope and a right hoisting rope from left to right, the left hoisting rope and the right hoisting rope are symmetrically distributed, and the middle hoisting rope is vertically distributed; the upper end of the middle lifting rope is fixed on the lifting appliance, and the lower end of the middle lifting rope passes through the middle lifting hole and then is fixed on the lifting frame; the left lifting rope and the right lifting rope are hung on the lifting appliance; two ends of the left lifting rope are fixedly connected into a whole, and one end of the left lifting rope is fixedly connected with the other end of the left lifting rope after passing through the left upper lifting hole, the lifting frame and the left lower lifting hole; two ends of the right lifting rope are fixedly connected into a whole, and one end of the right lifting rope is fixedly connected with the other end of the right lifting rope after passing through the right upper lifting hole, the lifting frame and the right lower lifting hole;

the two rope saws are horizontally arranged, each rope saw is supported on a rope saw mounting platform, and the rope saw mounting platforms are horizontally arranged; the upper surfaces of the left side arching structure and the right side arching structure are rope saw mounting platforms, and the two rope saw mounting platforms are platforms formed by dismantling the arching structure in the masonry structure of the mortar rubble.

The construction structure is demolishd to the existing line arched bridge arch ring of striding above-mentioned, characterized by: and the three hoisting ropes are all steel wire ropes.

The construction structure is demolishd to the existing line arched bridge arch ring of striding above-mentioned, characterized by: the crane working platform is a concrete platform.

The construction structure is demolishd to the existing line arched bridge arch ring of striding above-mentioned, characterized by: and the two crane working platforms are respectively positioned at the front side and the rear side of the right side under-arch structure.

The construction structure is demolishd to the existing line arched bridge arch ring of striding above-mentioned, characterized by: the hanging bracket comprises an upper bracket body, a lower bracket body arranged right below the upper bracket body and a plurality of connecting brackets connected between the upper bracket body and the lower bracket body, wherein the upper bracket body and the lower bracket body are both arc-shaped brackets formed by welding a plurality of profile steel rod pieces; the connecting frames are arranged from left to right along the contour line of the hanging bracket, each connecting frame is a rectangular support, and each connecting frame is integrally welded with the upper frame body and the lower frame body.

The construction structure is demolishd to the existing line arched bridge arch ring of striding above-mentioned, characterized by: two rope portions of the left sling and between the arch rings to be hoisted are left-side internal rope portions and left-side external rope portions respectively, two rope portions of the right sling and between the arch rings to be hoisted are right-side internal rope portions and right-side external rope portions, the left-side internal rope portions are left-side external rope portions, the right-side internal rope portions are right-side external rope portions, the right-side external rope portions are straight rope portions, and the left-side internal rope portions and the right-side internal rope portions are 45 degrees in included angle.

The construction structure is demolishd to the existing line arched bridge arch ring of striding above-mentioned, characterized by: the section steel rod piece is H-shaped steel.

The construction structure is demolishd to the existing line arched bridge arch ring of striding above-mentioned, characterized by: the width of the removed arch ring is not less than 5m, and the width of the arch ring to be hoisted is not more than 0.75 m.

Compared with the prior art, the utility model has the following advantage:

1. simple structure, reasonable in design and input construction cost are lower.

2. The two rope saws symmetrically arranged on the left and right are adopted to cut the removed arch ring, and the rope saw mounting platforms arranged on the two rope saws are formed after the arch structure in the removed arch bridge is removed, so that the two rope saws are simply and conveniently arranged, a special mounting platform is not required to be erected, the investment cost is low, and the rope saw mounting platform is economical and practical; and adopt two rope saws will be demolishd after the arch ring cuts into a plurality of arch rings of being hoisted, the hoist and mount of being more convenient for to the hoist and mount process is changeed in the control.

3. A plurality of hoisted arch rings cut by the dismantled arch ring are symmetrically hoisted by adopting the front and the rear cranes, the actual hoisting is simple and convenient, and the dismantling process of the dismantled arch ring is safer and more reliable.

4. The number of the hoisting holes on the arch ring to be hoisted and the layout position of each hoisting hole are reasonably designed, and the number of the hoisting holes on the arch ring to be hoisted does not have too much or too little phenomenon, so that the problems that the center of gravity of the arch ring to be hoisted is easy to deflect in the hoisting process in a single-point hoisting mode, the shear stress on the section of the arch ring at the hoisting point is greater than the shear strength of concrete after the plain concrete arch ring is turned over, the arch ring is broken from the hoisting point position, and the hoisting and dismantling cannot be performed and the like can be effectively solved; meanwhile, the problem that the arch ring is broken from the position of the lifting point at one side with large distributed load due to the fact that the load distributed at the lifting point at one side is large and the shear stress borne by the cross section of the arch ring at the lifting point is larger than the shear strength of concrete in the gravity center balancing process of the arch ring to be lifted in the double-point lifting mode can be effectively solved. Moreover, the number of the hoisting holes on the arch ring to be hoisted is not more than 5, so that the problem that the arch ring to be hoisted is damaged due to the excessive number of the hoisting holes can be effectively avoided.

During actual hoisting, the vault hoisting point corresponding to the middle hoisting hole does not bear load, and the main function is to balance the center of gravity in the hoisting process. Among the four hoisting points except the vault hoisting point, two corresponding hoisting points of the upper hoisting hole on the left side and the lower hoisting hole on the left side are serially connected and hoisted by adopting the same steel wire rope, two corresponding hoisting points of the upper hoisting hole on the right side and the lower hoisting hole on the right side are serially connected and hoisted by adopting the same steel wire rope, the hoisting is stable and firm, and the left lower hanging hole and the right lower hanging hole are positioned on the same horizontal plane with the gravity center of the arch ring to be hoisted, when hoisting, the steel wire ropes on the left side and the right side slide on the lifting hooks until the stress is balanced, thereby solving the load distribution problem of each hoisting point, the load born by each of the four hoisting points on the arch ring to be hoisted except the middle hoisting point is one fourth of the total load (namely the sum of the self weight of the arch ring to be hoisted and the self weight of the hanger), therefore, the shear stress on the cross section of the arch ring where the four hoisting points except the middle hoisting point are positioned is smaller than the shear strength of the concrete, so that the arch ring to be hoisted cannot be broken in the hoisting process.

5. The crane working platform is reasonable in layout position and simple and convenient to construct, and can meet the requirement of narrow construction on site.

6. The adopted hanger has simple structure, reasonable design, simple and convenient processing and good use effect, is convenient for fixing the lifting rope on one hand, and can avoid the abrasion of the inner wall of the arch ring to be lifted at the lifting hole to the lifting rope; on the other hand from top to bottom treat that hoist and mount arch ring carries out whole, steady support, ensures to treat the wholeness and the steadiness of hoist and mount arch ring to be convenient for the balanced focus of treating hoist and mount arch ring ensures that the hoist and mount process is steady, firm, further ensures to lift by crane the in-process and can not appear treating the phenomenon that hoist and mount arch ring emergence rupture.

7. The use and operation are simple and convenient, the use effect is good, the practical value is high, the arch structure is firstly dismantled from top to bottom, the dismantled arch ring is exposed outside, and two rope saw mounting platforms are obtained; then, flatly placing the two rope saws on a rope saw mounting platform, and cutting the dismantled arch ring by adopting the two rope saws until the dismantled arch ring is cut into a plurality of arch rings to be hoisted; and then, symmetrically hoisting a plurality of arch rings to be hoisted in the dismantled arch ring by adopting two cranes. And after the removed arch ring is removed, the left side under-arch structure and the right side under-arch structure are removed respectively, so that the removal process of the removed arch bridge is completed, the removal process of the removed arch bridge arch ring is simpler and faster, and the interference of the removal process of the removed arch bridge arch ring on the crossed existing railway line is very small. In addition, five hoisting holes are formed in the middle of the arch ring to be hoisted from left to right, the arrangement positions of the five hoisting holes are specifically limited, arch crown hoisting points corresponding to the middle hoisting holes do not bear loads, the left two hoisting holes share one steel wire rope, the right two hoisting holes share the other steel wire rope, the steel wire ropes on the left side and the right side slip on the lifting appliance until the stress is balanced during hoisting, the load distribution problem of each hoisting point is solved, the arch ring to be hoisted can be hoisted stably and rapidly, and the problem that the arch ring to be hoisted is broken in the hoisting process can be effectively solved.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic view of the demolition state of the present invention.

Fig. 2 is a schematic view of the vertical structure of the arch bridge where the removed arch ring is located.

Fig. 3 is a schematic plan view of the removed arch ring of the present invention.

Fig. 4 is the utility model discloses treat that the plane of five hole for hoist on the hoist and mount arch ring lays the position schematic diagram.

Fig. 5 is the utility model discloses treat that the facade of five hole for hoist on the hoist and mount arch ring lays the position sketch map.

Fig. 6 is a schematic view of the vertical structure of the hanger of the present invention.

Fig. 7 is a schematic view of the hoisting state of the crane.

Fig. 8 is the hoisting state diagram of the arch ring to be hoisted.

Fig. 9 is a schematic view of the cutting state of the two rope saws of the present invention.

Fig. 10 is a schematic view of the two rope saws of the present invention in the plane layout position.

Fig. 11 is a schematic plane layout position diagram of two crane working platforms of the present invention.

Description of reference numerals:

1, a crane; 2-the arch bridge is dismantled; 2-1-a middle open cut tunnel;

2-vertical sidewalls; 2-3-middle arch ring;

3, side slope; 4-crane working platform; 5, lifting a hanger;

6-arch ring to be hoisted; 7-1-a middle hoisting hole; 7-2-left upper lifting hole;

7-3-hanging hole at upper part of right side; 7-4-left lower lifting hole;

7-5-right lower hanging hole; 8, hanging bracket; 8-1-upper frame body;

8-2-lower frame body; 8-3-a link; 9-1-left side lifting rope;

9-2-middle lifting rope; 9-3-right lifting rope; 10-a rope saw;

11-a rope saw mounting platform; 12-stringing holes.

Detailed Description

As shown in fig. 1, 9 and 10, the utility model comprises a rope saw 10 which is symmetrically arranged at the left and right sides and is used for cutting a dismantled arch ring into N arch rings 6 to be hoisted from front to back, and a crane 1 which is used for hoisting the arch rings 6 to be hoisted formed after cutting one by one at the front and the back, wherein the dismantled arch ring is an arch ring of a dismantled arch bridge 2, the dismantled arch ring is horizontally arranged and has a semicircular cross section, and the two rope saws 10 are arranged on the same vertical surface; a hoisting structure for hoisting an arch ring 6 to be hoisted is arranged below the hoisting arm of each crane 1; wherein N is a positive integer and N is not less than 5;

with reference to fig. 2, the removed arch bridge 2 is located between a left side slope and a right side slope 3, the removed arch bridge 2 is a masonry structure of grouted rubble stone which is vertically arranged and spans an existing railway line, a middle open cut tunnel 2-1 through which the existing railway line passes is arranged below the middle of the removed arch bridge 2, the top of the middle open cut tunnel 2-1 is arched, the left side wall and the right side wall of the middle open cut tunnel are vertical side walls 2-2 which are arranged along the transverse bridge direction, the removed arch ring is a middle arch ring 2-3 located at the top of the open cut tunnel 2-1, the middle arch ring 2-3 is a plain concrete arch ring, and the two vertical side walls 2-2 of the middle open cut tunnel 2-1 are symmetrically arranged below the left side and the right side of the middle arch ring 2-3; the masonry structure of the mortar rubble is divided into an arch-up structure positioned above the middle arch ring 2-3 and an arch-down structure positioned below the middle arch ring 2-3 by taking the middle arch ring 2-3 as a boundary, the arch-down structure is supported on the ground, the upper surface of the arch-down structure is flush with the upper surface of the vertical side wall 2-2, and the arch-down structure is divided into a left-side arch-down structure and a right-side arch-down structure by taking the middle open cut tunnel 2-1 as a boundary;

with reference to fig. 7, 8 and 11, two cranes 1 are respectively located at the front and rear sides of the left side under-arch structure or the right side under-arch structure, each crane 1 is supported on a crane working platform 4 which is horizontally arranged, and the two crane working platforms 4 are respectively arranged on the ground at the front and rear sides of the removed arch bridge 2;

as shown in fig. 3, the arch ring to be dismantled is divided into N arch rings 6 to be hoisted from front to back along the width direction, the cross sections of the N arch rings 6 to be hoisted are all semicircular, and the cross section structures and the sizes of the N arch rings 6 to be hoisted are all the same as those of the arch ring to be dismantled; n-1 groups of rope-penetrating holes 12 for a rope saw chain of a rope saw 10 to penetrate through are formed in the dismantled arch ring from front to back in the width direction, each group of rope-penetrating holes 12 are located on the same cross section of the dismantled arch ring, and the plane where each group of rope-penetrating holes 12 is located is a cutting surface of the dismantled arch ring; each group of rope penetrating holes 12 comprises three rope penetrating holes 12 positioned on the same cross section of the removed arch ring, each three rope penetrating hole 12 comprises a middle rope penetrating hole and two side rope penetrating holes which are symmetrically arranged on the left and right, each middle rope penetrating hole is vertically arranged and positioned in the middle of the arch ring 6 to be hoisted, and the two side rope penetrating holes are symmetrically arranged on arch feet on the left and right sides of the arch ring 6 to be hoisted;

each hoisting structure comprises a hanger 8 supported at the bottom of the arch ring 6 to be hoisted and a group of hoisting ropes for synchronously hoisting the hanger 8 and the arch ring 6 to be hoisted supported above the hanger 8, the hanger 8 is an arc hoisting frame formed by welding a plurality of steel bar members, the arc hoisting frame is positioned right below the arch ring 6 to be hoisted, and the upper surface of the arc hoisting frame is in contact with the bottom surface of the arch ring 6 to be hoisted;

with reference to fig. 4 and 5, five hoisting holes are formed in the middle of the arch ring 6 to be hoisted from left to right, the five hoisting holes are uniformly distributed on the same cross section of the removed arch ring, the five hoisting holes are all cylindrical straight drilling holes and are distributed from left to right along the outer contour line of the arch ring 6 to be hoisted, and the central axes of the five hoisting holes are intersected on the circle center O of the arch ring 6 to be hoisted; the five hoisting holes comprise a middle hoisting hole 7-1 positioned at the arch crown of the arch ring 6 to be hoisted, two upper hoisting holes symmetrically arranged left and right and two lower hoisting holes symmetrically arranged left and right, the included angles between the two upper hoisting holes and the horizontal plane are both 45 degrees, and the geometric center points of the two lower hoisting holes and the center of gravity of the arch ring 6 to be hoisted are positioned on the same horizontal straight line; the two upper hoisting holes are respectively a left upper hoisting hole 7-2 and a right upper hoisting hole 7-3 which are positioned at the left and right sides of the middle hoisting hole 7-1, and the two lower hoisting holes are respectively a left lower hoisting hole 7-4 and a right lower hoisting hole 7-5 which are positioned at the left and right sides of the middle hoisting hole 7-1;

each group of hoisting ropes comprises three hoisting ropes hung between a hoisting device 5 of the crane 1 and an arch ring 6 to be hoisted, and each hoisting frame 8 and the arch ring 6 to be hoisted supported by the hoisting frame are hung under one hoisting device 5 through one group of hoisting ropes; the three hoisting ropes are uniformly distributed on the same vertical surface and are respectively a left hoisting rope 9-1, a middle hoisting rope 9-2 and a right hoisting rope 9-3 from left to right, the left hoisting rope 9-1 and the right hoisting rope 9-3 are symmetrically distributed, and the middle hoisting rope 9-2 is vertically distributed; the upper end of the middle lifting rope 9-2 is fixed on the lifting appliance 5, and the lower end of the middle lifting rope passes through the middle lifting hole 7-1 and then is fixed on the lifting frame 8; the left lifting rope 9-1 and the right lifting rope 9-3 are hung on the lifting appliance 5; two ends of the left lifting rope 9-1 are fixedly connected into a whole, and one end of the left lifting rope 9-1 is fixedly connected with the other end of the left lifting rope after passing through a left upper lifting hole 7-2, a lifting frame 8 and a left lower lifting hole 7-4; two ends of the right lifting rope 9-3 are fixedly connected into a whole, and one end of the right lifting rope 9-3 is fixedly connected with the other end of the right lifting rope after passing through a right upper lifting hole 7-3, a lifting frame 8 and a right lower lifting hole 7-5;

the two rope saws 10 are horizontally arranged, each rope saw 10 is supported on a rope saw mounting platform 11, and the rope saw mounting platforms 11 are horizontally arranged; the upper surfaces of the left side arching structure and the right side arching structure are rope saw mounting platforms 11, and the two rope saw mounting platforms 11 are platforms formed by dismantling the arching structure in the masonry structure of the mortar rubble.

Wherein, the gravity center of the arch ring 6 to be hoisted is marked as a point M; the center of gravity is the point in the gravitational field where the resultant of the gravitational forces of all the component fulcrums passes when the object is in any orientation. The circle center O of the arch ring 6 to be hoisted refers to the center of a circle where the outer contour line or the inner contour line of the arch ring 6 to be hoisted is located.

In this embodiment, the lifting device 5 is a lifting hook.

Referring to fig. 9 and 10, the two rope saws 10 are respectively a left rope saw and a right rope saw which are positioned at the left side and the right side of the middle arch ring 2-3.

In this embodiment, the two wire saws 10 are diamond wire saws, and the wire saw chain of the wire saw 10 is made of a diamond material.

In this embodiment, the wire saw chain of the wire saw 10 is a diamond beaded wire.

Two side rope-threading holes in each group of rope-threading holes 12 are respectively a left rope-threading hole and a right rope-threading hole which are positioned on the left and right arch feet of the middle arch ring 2-3. During actual use, the rope saw chain of the left rope saw penetrates through the middle rope threading hole and then penetrates through the left rope threading hole, and the joint between the front and the rear two arches 6 to be hoisted is cut through the left rope saw. Correspondingly, the rope saw chain of the right rope saw penetrates through the middle rope threading hole and then penetrates through the right rope threading hole, and the joint between the front and the rear arch rings 6 to be hoisted is cut through the right rope saw.

During actual construction, the two rope saws 10 are adopted to cut the removed arch ring synchronously, and the two rope saws 10 are adopted to cut the removed arch ring from front to back along the width direction of the removed arch ring until the removed arch ring is cut into M arch rings 6 to be hoisted.

In this embodiment, the widths of the M arch rings 6 to be hoisted in the dismantled arch ring are the same.

And after cutting the removed arch ring into M arch rings 6 to be hoisted, symmetrically hoisting the M arch rings 6 to be hoisted by adopting the two cranes 1.

As shown in fig. 11, in this embodiment, two crane work platforms 4 are respectively located at the front and rear sides of the right under-arch structure. During actual use, the two crane working platforms 4 can be respectively positioned on the front side and the rear side of the left side under-arch structure, and the supporting requirements of the crane can be met.

The two cranes 1 are respectively a front crane and a rear crane which are positioned at the front side and the rear side of the right side under-arch structure. In practical use, the front side crane and the rear side crane are adopted to symmetrically hoist the M arch rings 6 to be hoisted, so that the safety and reliability of the dismantling process can be ensured. In this embodiment, adopt the front side loop wheel machine to treat by the preceding back and hoist one by one and hoist arch ring 6, adopt the rear side loop wheel machine to treat by the back and hoist one by one and hoist arch ring 6 simultaneously.

During actual construction, the width of the removed arch ring is not less than 5m, and the width of the arch ring 6 to be hoisted is not more than 0.75 m. In this embodiment, the removed arch ring has a width of 10 m.

In this embodiment, N is 14.

During actual construction, the value of N can be correspondingly adjusted according to the width of the dismantled arch ring and the width of the arch ring 6 to be hoisted.

In this embodiment, the middle arch ring 2-3 is divided into 14 arch rings 6 to be hoisted from front to back along the width direction.

During actual construction, the number of the arch rings 6 to be hoisted included in the middle arch rings 2 to 3 and the layout positions of the arch rings 6 to be hoisted can be respectively and correspondingly adjusted according to specific requirements, and only each arch ring 6 to be hoisted can meet the hoisting requirement of the crane 1. In this embodiment, the crane 1 is an 80-ton crane.

In this embodiment, the construction area where the removed arch bridge 2 is located is narrow, the total length of the removed arch bridge 2 is 34m, the width of the bridge deck of the removed arch bridge 2 is 10m, the width of the middle arch ring 2-3 is the same as the width of the bridge deck of the removed arch bridge 2, so that the width of the middle arch ring 2-3 (i.e., the removed arch ring) is 10m, the thickness of the middle arch ring 2-3 is 60cm, and the clear span of the middle arch ring 2-3 is 5.6m, and the clear span of the middle arch ring 2-3 refers to the distance between the two vertical side walls 2-2 of the middle open cut tunnel 2-1.

In this embodiment, three hoisting ropes are steel wire ropes.

And, the crane working platform 4 is a concrete platform.

As shown in fig. 6, the hanger 8 includes an upper frame body 8-1, a lower frame body 8-2 arranged right below the upper frame body 8-1, and a plurality of connecting frames 8-3 connected between the upper frame body 8-1 and the lower frame body 8-2, wherein the upper frame body 8-1 and the lower frame body 8-2 are arc-shaped brackets formed by welding a plurality of steel bars; the connecting frames 8-3 are arranged from left to right along the contour line of the hanging bracket 8, each connecting frame 8-3 is a rectangular support, and each connecting frame 8-3 is welded and fixed with the upper frame body 8-1 and the lower frame body 8-2 into a whole. In this embodiment, the central axis of each upper hoisting hole is provided with one connecting frame 8-3, and the central axis of each lower hoisting hole is provided with one connecting frame 8-3.

In this embodiment, the steel bar is H-shaped steel.

In actual processing, the section steel bar can be made of other types of bars.

As shown in fig. 1, in this embodiment, two rope portions of the left lifting rope 9-1 between the lifting appliance 5 and the arch ring 6 to be lifted are a left inner rope portion and a left outer rope portion located on the left side of the left inner rope portion, two rope portions of the right lifting rope 9-3 between the lifting appliance 5 and the arch ring 6 to be lifted are a right inner rope portion and a right outer rope portion located on the right side of the right inner rope portion, the left outer rope portion, the right inner rope portion and the right outer rope portion are straight rope portions, and an included angle between the left inner rope portion and the right inner rope portion is 45 °.

When the dismantled arch bridge 2 is dismantled, the arch structure is dismantled from top to bottom, so that the dismantled arch rings are exposed outside, and two rope saw mounting platforms 11 are obtained; then, horizontally placing the two rope saws 10 on one rope saw installation platform 11, and cutting the removed arch ring by adopting the two rope saws 10 until the removed arch ring is cut into 14 arch rings 6 to be hoisted; and then, symmetrically hoisting 14 arch rings 6 to be hoisted in the dismantled arch rings by using the two cranes 1. The two cranes 1 only hoist one arch ring 6 to be hoisted at a time, the hoisting methods of the two cranes 1 for the arch rings 6 to be hoisted are the same, each arch ring 6 to be hoisted in the dismantled arch ring is hoisted to a preset storage area, the dismantling process of the dismantled arch ring is completed, and finally the left side under-arch structure and the right side under-arch structure are dismantled respectively, so that the dismantling process of the dismantled arch bridge 2 is completed.

When the crane 1 is adopted to hoist any one of the arch rings 6 to be hoisted, the arch ring 6 to be hoisted is hoisted below the hoisting arm of the crane 1 through one hoisting structure, and then the arch ring 6 to be hoisted is hoisted through the crane 1.

The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.

Claims (8)

1. The utility model provides a construction structures is demolishd to existing line arched bridge arch ring of striding on, its characterized in that: the device comprises a left rope saw (10) and a right rope saw (10) which are symmetrically arranged and cut a dismantled arch ring into N arch rings (6) to be hoisted from front to back, and a front crane (1) and a rear crane (1) which respectively hoist the arch rings (6) to be hoisted formed after cutting one by one, wherein the dismantled arch ring is an arch ring of a dismantled arch bridge (2), the dismantled arch ring is horizontally arranged, the cross section of the dismantled arch ring is semicircular, and the two rope saws (10) are arranged on the same vertical surface; a hoisting structure for hoisting an arch ring (6) to be hoisted is arranged below the hoisting arm of each crane (1); wherein N is a positive integer and N is not less than 5;

the demolished arch bridge (2) is positioned between the left and right slopes (3), the demolished arch bridge (2) is a masonry structure of mortar rubble which is vertically arranged and spans the existing railway line, a middle open cut tunnel (2-1) for the existing railway line to pass through is arranged below the middle part of the dismantled arch bridge (2), the top of the middle open cut tunnel (2-1) is arched, the left side wall and the right side wall of the middle open cut tunnel are vertical side walls (2-2) arranged along the transverse bridge direction, the removed arch ring is a middle arch ring (2-3) positioned at the top of the open cut tunnel (2-1), the middle arch ring (2-3) is a plain concrete arch ring, the two vertical side walls (2-2) of the middle open cut tunnel (2-1) are symmetrically arranged below the left side and the right side of the middle arch ring (2-3); the masonry structure of the mortar rubble is divided into an arch-up structure positioned above the middle arch ring (2-3) and an arch-down structure positioned below the middle arch ring (2-3) by taking the middle arch ring (2-3) as a boundary, the arch-down structure is supported on the ground, the upper surface of the arch-down structure is flush with the upper surface of the vertical side wall (2-2), and the arch-down structure is divided into a left-side arch-down structure and a right-side arch-down structure by taking the middle open cut tunnel (2-1) as a boundary;

the two cranes (1) are respectively positioned at the front side and the rear side of the left side under-arch structure or the right side under-arch structure, each crane (1) is supported on a crane working platform (4) which is horizontally arranged, and the two crane working platforms (4) are respectively arranged on the ground at the front side and the rear side of the arch bridge (2) to be dismantled;

the arch ring to be dismantled is divided into N arch rings (6) to be hoisted from front to back along the width direction, the cross sections of the N arch rings (6) to be hoisted are semicircular, and the cross section structures and the sizes of the N arch rings (6) to be hoisted are the same as those of the arch ring to be dismantled; n-1 groups of rope-penetrating holes (12) for a rope saw chain of a rope saw (10) to penetrate through are formed in the dismantled arch ring from front to back along the width direction, each group of rope-penetrating holes (12) are located on the same cross section of the dismantled arch ring, and the plane where each group of rope-penetrating holes (12) are located is a cutting surface of the dismantled arch ring; each group of rope penetrating holes (12) comprises three rope penetrating holes (12) which are positioned on the same cross section of the removed arch ring, each three rope penetrating hole (12) comprises a middle rope penetrating hole and two side rope penetrating holes which are symmetrically arranged from left to right, each middle rope penetrating hole is vertically arranged and positioned in the middle of the arch ring (6) to be hoisted, and the two side rope penetrating holes are symmetrically arranged on arch feet on the left side and the right side of the arch ring (6) to be hoisted;

each hoisting structure comprises a hanger (8) supported at the bottom of an arch ring (6) to be hoisted and a group of hoisting ropes for synchronously hoisting the hanger (8) and the arch ring (6) to be hoisted supported above the hanger (8), the hanger (8) is an arc hoisting frame formed by welding a plurality of steel bar pieces, the arc hoisting frame is positioned under the arch ring (6) to be hoisted, and the upper surface of the arc hoisting frame is in contact with the bottom surface of the arch ring (6) to be hoisted;

five hoisting holes are formed in the middle of the arch ring (6) to be hoisted from left to right, the five hoisting holes are uniformly distributed on the same cross section of the removed arch ring, the five hoisting holes are all cylindrical straight drilled holes and are distributed from left to right along the outer contour line of the arch ring (6) to be hoisted, and the central axes of the five hoisting holes are intersected on the circle center O of the arch ring (6) to be hoisted; the five hoisting holes comprise a middle hoisting hole (7-1) positioned at the arch top of the arch ring (6) to be hoisted, two upper hoisting holes symmetrically arranged at the left and right sides and two lower hoisting holes symmetrically arranged at the left and right sides, the included angles between the two upper hoisting holes and the horizontal plane are both 45 degrees, and the geometric center points of the two lower hoisting holes and the center of gravity of the arch ring (6) to be hoisted are positioned on the same horizontal straight line; the two upper hoisting holes are respectively a left upper hoisting hole (7-2) and a right upper hoisting hole (7-3) which are positioned at the left side and the right side of the middle hoisting hole (7-1), and the two lower hoisting holes are respectively a left lower hoisting hole (7-4) and a right lower hoisting hole (7-5) which are positioned at the left side and the right side of the middle hoisting hole (7-1);

each group of hoisting ropes comprises three hoisting ropes hung between a hoisting device (5) of the crane (1) and an arch ring (6) to be hoisted, and each hoisting frame (8) and the arch ring (6) to be hoisted supported by the hoisting frame are hung under one hoisting device (5) through one group of hoisting ropes; the three hoisting ropes are uniformly distributed on the same vertical surface and respectively comprise a left hoisting rope (9-1), a middle hoisting rope (9-2) and a right hoisting rope (9-3) from left to right, the left hoisting rope (9-1) and the right hoisting rope (9-3) are symmetrically distributed, and the middle hoisting rope (9-2) is vertically distributed; the upper end of the middle lifting rope (9-2) is fixed on the lifting appliance (5), and the lower end of the middle lifting rope passes through the middle lifting hole (7-1) and then is fixed on the lifting frame (8); the left lifting rope (9-1) and the right lifting rope (9-3) are hung on the lifting appliance (5); two ends of the left lifting rope (9-1) are fixedly connected into a whole, and one end of the left lifting rope (9-1) is fixedly connected with the other end of the left lifting rope after passing through a left upper lifting hole (7-2), a lifting frame (8) and a left lower lifting hole (7-4); two ends of the right lifting rope (9-3) are fixedly connected into a whole, and one end of the right lifting rope (9-3) is fixedly connected with the other end of the right lifting rope after passing through the right upper lifting hole (7-3), the hanger (8) and the right lower lifting hole (7-5);

the two rope saws (10) are horizontally arranged, each rope saw (10) is supported on a rope saw mounting platform (11), and the rope saw mounting platforms (11) are horizontally arranged; the upper surfaces of the left side arching structure and the right side arching structure are rope saw mounting platforms (11), and the two rope saw mounting platforms (11) are platforms formed after the arching structure in the mortar rubble masonry structure is dismantled.

2. The existing line arch bridge arch ring demolition construction structure of the upper span according to claim 1, wherein: and the three hoisting ropes are all steel wire ropes.

3. The existing line arch bridge arch ring demolition construction structure of the upper span according to claim 1 or 2, wherein: the crane working platform (4) is a concrete platform.

4. The existing line arch bridge arch ring demolition construction structure of the upper span according to claim 1 or 2, wherein: the two crane working platforms (4) are respectively positioned at the front side and the rear side of the right side under-arch structure.

5. The existing line arch bridge arch ring demolition construction structure of the upper span according to claim 1 or 2, wherein: the hanging bracket (8) comprises an upper bracket body (8-1), a lower bracket body (8-2) arranged right below the upper bracket body (8-1) and a plurality of connecting brackets (8-3) connected between the upper bracket body (8-1) and the lower bracket body (8-2), wherein the upper bracket body (8-1) and the lower bracket body (8-2) are arc-shaped brackets formed by welding a plurality of profile steel rod pieces; the connecting frames (8-3) are arranged from left to right along the contour line of the hanging bracket (8), each connecting frame (8-3) is a rectangular support, and each connecting frame (8-3) is integrally welded with the upper frame body (8-1) and the lower frame body (8-2).

6. The existing line arch bridge arch ring demolition construction structure of the upper span according to claim 1 or 2, wherein: two rope portions of the left lifting rope (9-1) between the lifting appliance (5) and the arch ring (6) to be lifted are left-side inner rope portions and left-side outer rope portions respectively, two rope portions of the right lifting rope (9-3) between the lifting appliance (5) and the arch ring (6) to be lifted are right-side inner rope portions and right-side outer rope portions on the right side of the right-side inner rope portions respectively, the left-side inner rope portions, the left-side outer rope portions, the right-side inner rope portions and the right-side outer rope portions are straight rope portions, and the included angle between the left-side inner rope portions and the right-side inner rope portions is 45 degrees.

7. The existing line arch bridge arch ring demolition construction structure of the upper span according to claim 1 or 2, wherein: the section steel rod piece is H-shaped steel.

8. The existing line arch bridge arch ring demolition construction structure of the upper span according to claim 1 or 2, wherein: the width of the removed arch ring is not less than 5m, and the width of the arch ring (6) to be hoisted is not more than 0.75 m.

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